Turtle - Tunneler with Chest and Torch by VDp v2.

function refuel()
 turtle.select(3)
 turtle.refuel()
 turtle.select(1)
end

function chest()
 if turtle.getItemCount(16)>0 then
                        turtle.turnRight()
                        turtle.digDown()
                        turtle.down()
                        turtle.dig()
                        turtle.select(2)
                        turtle.place()
                        for h=3,16 do
                                turtle.select(h)
                                turtle.drop()
                        end
                        turtle.select(1)
                        turtle.turnLeft()
                        turtle.up()
                end
end

function dig(count)
 for i = 1, count do
  turtle.dig()
  turtle.forward()
  turtle.dig()
  turtle.digUp()
  turtle.digDown()
  turtle.turnRight()
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  chest()
  turtle.turnRight()
  turtle.turnRight()
  turtle.forward()
  turtle.dig()
  turtle.forward()
  turtle.digUp()
  turtle.digDown()
  turtle.turnRight()
  turtle.turnRight()
  turtle.forward()
  turtle.turnLeft()
 end
end

function torch()
 turtle.select(1)
 turtle.placeDown()
end


turtle.select(16)
refuel()
turtle.select(1)
while true do
dig(7)
torch()
end